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All Journal Jurnal Bahan Alam Terbarukan INDONESIAN JOURNAL OF APPLIED PHYSICS Metalurgi
Nadi, Muhammad Rizki Gorbyandi
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Astronomy Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Surface Evaluation of Tricalcium Phosphate Bioceramic Coating on SS-316L by Electrophoretic Deposition Hermana, Gita Novian; Nugraha, Dhion Khairul; Nadi, Muhammad Rizki Gorbyandi; Sektiono, Moch. Wisnu Arif; Mayello, Randy Mediawan; Farhan, Miftah; Kusuma, Nirmala Cahya; Alfayed, Naufal Alden; Rizqi, Fauzi Muhamad
Jurnal Bahan Alam Terbarukan Vol 13, No 1 (2024): June 2024 [Nationally Accredited Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v13i1.49639

Abstract

The development of orthopedic implant materials has become an important topic of discussion lately. The SS-316L alloy is widely used as an implant material due to its relatively low cost, corrosion resistance, and ease of production. However, metal alloys, especially SS-316L, are prone to ion release into the blood over time. Therefore, TCP or tricalcium phosphate [Ca3(PO4)2] is needed to coat the surface of SS-316L, preventing ion release into the blood and enhancing the biocompatibility of the implant material. In this study, TCP coating was applied to the SS-316L substrate using the electrophoretic deposition technique. The influence of deposition time on changes in microstructure and mechanical properties is the main focus of this study. The results of the coating technique indicate that the deposition yield increases with the deposition time. Morphological testing results show that increasing deposition time improves coating quality by increasing the thickness of the coating layer and preventing layer peeling. The coating process also reveals the accumulation of layers in certain areas and the formation of thin layers in other regions. A deposition time of 30 minutes results in a coating thickness ranging from 48.7 to 57.9 µm. Hardness testing, conducted with indentation loads of 50, 100, and 300 gf, indicates that longer deposition times and higher indentation loads during hardness testing result in reduced material hardness.
Investigation of Failure Mechanisms in the U-Bend Tubes of Shell and Tube Heat Exchangers Achyarsyah, Mochamad; Hanaldi, Kus; Purwadi, Wiwik; Hermana, Gita Novian; Siswanto, Ari; Ruskandi, Cecep; Nadi, Muhammad Rizki Gorbyandi
Metalurgi Vol 39, No 3 (2024): Metalurgi Vol. 39 No. 3 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.775

Abstract

The U-bend tubes of a shell-and-tube heat exchanger made of SA-234 Grade WPB carbon steel failed prematurely within 14 days after replacement and welding. This study investigates failure mechanisms through an integrated failure analysis that includes visual inspection, dye penetrant testing, chemical composition analysis, hardness measurements, and microstructural characterization. The results reveal that the tube contained 0.324 wt.% C, exceeding the maximum limit specified by the standard, which promoted the formation of Widmanstätten ferrite and reduced toughness. The welded joint exhibited multiple defects, including porosity and lack of fusion, which acted as stress concentration sites. Hardness measurements showed average values of 205 HV in the weld metal, 199 HV in the HAZ (heat-affected zone), and 184 HV in the base metal. Under operating conditions of 275 °C and 58.48 barg, these defects progressively opened, leading to fluid leakage. The escaping high-pressure fluid accelerated erosion-corrosion, as evidenced by oxygen-rich corrosion products detected by EDS analysis. The findings demonstrate that the combined effects of material non-compliance, poor welding quality, and unfavorable microstructural evolution governed the premature failure. This study provides quantitative insights to improve welding practices and material selection, thereby enhancing the reliability of U-bend tubes in shell-and-tube heat exchangers.
Pendekatan Hukum Stokes Pada Proses Terjadinya Slag Untuk Meningkatkan Efektifitas Pembersihan Cairan Logam Pada Proses Peleburan Besi Cor Nadi, Muhammad Rizki Gorbyandi; Ruskandi, Cecep; Siswanto, Ari; Koswara, Eko
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 2 (2022): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.57997

Abstract

Tujuan dari penelitian ini adalah untuk meningkatkan efektifitas pembersihan slag pada proses peleburan besi cor. Penelitian ini menghasilkan perhitungan kecepatan terminal slag muncul ke permukaan tanur induksi berdasarkan pendekatan Hukum Stokes pada masing-masing slag yang muncul saat proses peleburan besi cor. Setiap pengecoran besi cor diambil tiga buah sampel berdasarkan waktu tercepat pada slag yang sangat ringan, waktu terlambat yang dimiliki oleh slag terberat dan waktu ekstrem sebagai pembanding. Hasil dari setiap sampel dilakukan pengujian karakterisasi seperti bentuk, ukuran dan komposisi kimia pada setiap sampel yang kemudian disesuaikan dengan perhitungan yang telah dibuat. Karakterisasi dianalisa dengan menggunakan X-ray diffraction, Scanning micrsocope elektro dan energy dispersive spectroscopy micro analysis. Hasil menunjukkan bahwa pendekatan hukum stokes untuk memprediksi slag mencapai permukaan mendapatkan hasil yang sesuai bahwa seluruh slag mencapai permukaan pada waktu t = 230 s. Slag yang muncul pada waktu t = 300 s merupakan slag yang terbentuk akibat interaksi cairan dengan permukaan yang bukan merupakan slag yang terjadi dari raw material yang digunakan. Penelitian ini berhasil untuk meminimalisir terbentuknya slag pada setiap pengecoran besi cor menggunakan tanur induksi.
Co-Authors Achyarsyah, Mochamad Alfayed, Naufal Alden Ari Siswanto, Ari Dhion Khairul Nugraha Farhan, Miftah Gita Novian Hermana Hanaldi, Kus Koswara, Eko Kusuma, Nirmala Cahya Mayello, Randy Mediawan Purwadi, Wiwik Rizqi, Fauzi Muhamad Ruskandi, Cecep Sektiono, Moch. Wisnu Arif